Because those 2 have a bigger install base thus making them decide oh ya we need to make this game soon to get it in those gamers hands. NX is about to come out next year & now talk of this game is floating around more just screams NX.

but since they have a big install base, they can release it almost whenever. they don't seem like they want to rush. Again, there are going to be other future games from other studios. it's not like every game is made at the same time and releases at the same time. Why is Paper Mario Color Splash only releasing now instead of a year or 2 ago?

Edit: Actually better examples would be Last Guardian and FFXV. They both were also first talked about a decade ago. They both are sequels to beloved franchises. They could have come out on PS3 which ended up successful. Or they could have come out before 2 months from now on PS4. Why the wait?

But that still doesn't say why FF15 or Last Guardian didn't come out like a year ago when everyone knew the PS4 was successful and they've had plenty of time. Knowing a console's success does not negate game development time. I'm not saying the game can't come to NX, but knowledge of a console's success does not the game would have been done and released by now. Again, if that were the case, other future games like Mass Effect Andromeda or Sonic Mania would be done and out by now.

I believe the rumor of this being an NX exclusive. I can imagine a Bayonetta 2 moneyhat scenario.... Nintendo needs third party support, Ubisoft doesn't want to fund a game that may or may not sell, there's a small but loyal fan base clamoring for a sequel... everyone wins. Well except for people who don't own an NX, but that's how the cookie crumbles.